The consumption of the 4-20 mA Board depends on several factors. When the battery is fully charged, the consumption of the board is lower due to the DC-DC converter. This DC-DC converter rises the voltage from the battery voltage level to 12 V, so if the battery level decreases, the energy needed to maintain the 12 V level is higher. The nominal consumption of the board is 8 mA without sensor. Also, if the 4-20 mA Board is used to power other sensors, the consumption will increase.